/*
 * HTMLTokenMarker.java - HTML token marker
 * Copyright (C) 1998, 1999 Slava Pestov
 *
 * You may use and modify this package for any purpose. Redistribution is
 * permitted, in both source and binary form, provided that this notice
 * remains intact in all source distributions of this package.
 */

package org.syntax.jedit.tokenmarker;

import javax.swing.text.Segment;

import org.syntax.jedit.KeywordMap;
import org.syntax.jedit.SyntaxUtilities;

/**
 * HTML token marker.
 * 
 * @author Slava Pestov
 * @version $Id: HTMLTokenMarker.java,v 1.34 1999/12/13 03:40:29 sp Exp $
 */
public class HTMLTokenMarker extends TokenMarker
{
    public static final byte JAVASCRIPT = Token.INTERNAL_FIRST;

    public HTMLTokenMarker()
    {
        this(true);
    }

    public HTMLTokenMarker(boolean js)
    {
        this.js = js;
        keywords = JavaScriptTokenMarker.getKeywords();
    }

    public byte markTokensImpl(byte token, Segment line, int lineIndex)
    {
        char[] array = line.array;
        int offset = line.offset;
        lastOffset = offset;
        lastKeyword = offset;
        int length = line.count + offset;
        boolean backslash = false;

        loop: for (int i = offset; i < length; i++)
        {
            int i1 = (i + 1);

            char c = array[i];
            if (c == '\\')
            {
                backslash = !backslash;
                continue;
            }

            switch (token)
            {
            case Token.NULL: // HTML text
                backslash = false;
                switch (c)
                {
                case '<':
                    addToken(i - lastOffset, token);
                    lastOffset = lastKeyword = i;
                    if (SyntaxUtilities.regionMatches(false, line, i1, "!--"))
                    {
                        i += 3;
                        token = Token.COMMENT1;
                    }
                    else if (js && SyntaxUtilities.regionMatches(true, line, i1, "script>"))
                    {
                        addToken(8, Token.KEYWORD1);
                        lastOffset = lastKeyword = (i += 8);
                        token = JAVASCRIPT;
                    }
                    else
                    {
                        token = Token.KEYWORD1;
                    }
                    break;
                case '&':
                    addToken(i - lastOffset, token);
                    lastOffset = lastKeyword = i;
                    token = Token.KEYWORD2;
                    break;
                }
                break;
            case Token.KEYWORD1: // Inside a tag
                backslash = false;
                if (c == '>')
                {
                    addToken(i1 - lastOffset, token);
                    lastOffset = lastKeyword = i1;
                    token = Token.NULL;
                }
                break;
            case Token.KEYWORD2: // Inside an entity
                backslash = false;
                if (c == ';')
                {
                    addToken(i1 - lastOffset, token);
                    lastOffset = lastKeyword = i1;
                    token = Token.NULL;
                    break;
                }
                break;
            case Token.COMMENT1: // Inside a comment
                backslash = false;
                if (SyntaxUtilities.regionMatches(false, line, i, "-->"))
                {
                    addToken((i + 3) - lastOffset, token);
                    lastOffset = lastKeyword = i + 3;
                    token = Token.NULL;
                }
                break;
            case JAVASCRIPT: // Inside a JavaScript
                switch (c)
                {
                case '<':
                    backslash = false;
                    doKeyword(line, i, c);
                    if (SyntaxUtilities.regionMatches(true, line, i1, "/script>"))
                    {
                        addToken(i - lastOffset, Token.NULL);
                        addToken(9, Token.KEYWORD1);
                        lastOffset = lastKeyword = (i += 9);
                        token = Token.NULL;
                    }
                    break;
                case '"':
                    if (backslash)
                        backslash = false;
                    else
                    {
                        doKeyword(line, i, c);
                        addToken(i - lastOffset, Token.NULL);
                        lastOffset = lastKeyword = i;
                        token = Token.LITERAL1;
                    }
                    break;
                case '\'':
                    if (backslash)
                        backslash = false;
                    else
                    {
                        doKeyword(line, i, c);
                        addToken(i - lastOffset, Token.NULL);
                        lastOffset = lastKeyword = i;
                        token = Token.LITERAL2;
                    }
                    break;
                case '/':
                    backslash = false;
                    doKeyword(line, i, c);
                    if (length - i > 1)
                    {
                        addToken(i - lastOffset, Token.NULL);
                        lastOffset = lastKeyword = i;
                        if (array[i1] == '/')
                        {
                            addToken(length - i, Token.COMMENT2);
                            lastOffset = lastKeyword = length;
                            break loop;
                        }
                        else if (array[i1] == '*')
                        {
                            token = Token.COMMENT2;
                        }
                    }
                    break;
                default:
                    backslash = false;
                    if (!Character.isLetterOrDigit(c) && c != '_')
                        doKeyword(line, i, c);
                    break;
                }
                break;
            case Token.LITERAL1: // JavaScript "..."
                if (backslash)
                    backslash = false;
                else if (c == '"')
                {
                    addToken(i1 - lastOffset, Token.LITERAL1);
                    lastOffset = lastKeyword = i1;
                    token = JAVASCRIPT;
                }
                break;
            case Token.LITERAL2: // JavaScript '...'
                if (backslash)
                    backslash = false;
                else if (c == '\'')
                {
                    addToken(i1 - lastOffset, Token.LITERAL1);
                    lastOffset = lastKeyword = i1;
                    token = JAVASCRIPT;
                }
                break;
            case Token.COMMENT2: // Inside a JavaScript comment
                backslash = false;
                if (c == '*' && length - i > 1 && array[i1] == '/')
                {
                    addToken((i += 2) - lastOffset, Token.COMMENT2);
                    lastOffset = lastKeyword = i;
                    token = JAVASCRIPT;
                }
                break;
            default:
                throw new InternalError("Invalid state: " + token);
            }
        }

        switch (token)
        {
        case Token.LITERAL1:
        case Token.LITERAL2:
            addToken(length - lastOffset, Token.INVALID);
            token = JAVASCRIPT;
            break;
        case Token.KEYWORD2:
            addToken(length - lastOffset, Token.INVALID);
            token = Token.NULL;
            break;
        case JAVASCRIPT:
            doKeyword(line, length, '\0');
            addToken(length - lastOffset, Token.NULL);
            break;
        default:
            addToken(length - lastOffset, token);
            break;
        }

        return token;
    }

    // private members
    private KeywordMap keywords;

    private boolean js;

    private int lastOffset;

    private int lastKeyword;

    private boolean doKeyword(Segment line, int i, char c)
    {
        int i1 = i + 1;

        int len = i - lastKeyword;
        byte id = keywords.lookup(line, lastKeyword, len);
        if (id != Token.NULL)
        {
            if (lastKeyword != lastOffset)
                addToken(lastKeyword - lastOffset, Token.NULL);
            addToken(len, id);
            lastOffset = i;
        }
        lastKeyword = i1;
        return false;
    }
}
